Exam (elaborations)
ILE Exam Hearing Aids Questions Correctly Answered 2023
- Course
- Institution
Hand Cupped Behind Ear >>-first Hearing Aid -increased sound by 5-8db -included horns,trumpets, speaking tubes 1892 >>-carbon amplifiers patent by Alexander Bell -marketed until 1930;first patent for a telephone type hearing instrument 1920 >>large vacuum tubes; not portable...
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